How's this for marketing? Slovakian Double Cross Vodka is filtered through diamond dust. You can only buy it in the US--at $49.95 for 750 ml.--not in Slovakia. I expect Slovaks know better.
The double cross is a symbol of Slovakia, but obviously this is a vodka for James Bond. His martinis were vodka not gin--Smirnoffs, it looks like. Here's a funny little piece about why Bond orders his martini "shaken not stirred."